Bad maf??

[Kayo Stanciu]

Having somewhat of a head scratcher.. my car is having a bogging issue when at WOT.. I checked for boost leaks already and I have none, spark plugs are new and gapped at .28, and the wires are also about a month maybe a little more old. CEL is on for fuel trim but not sure where to start on that.. any ideas on what it can be.. it drives fine if I slowly build up speed til about 4 1/2k-5k Rpms or if I step on it the car just feels like it hit a wall and bogs once again a boost leak test was performed and nothing was leaking..had a for installed and it’s set at 50psi I have 550 RC injectors and a 255 walbro pump. My AF ratio is all over the place jumping from 10-16.. on my apexi safc the karman reads roughly around 300-380hz cruising and when get on the throttle a bit more is around 650ish.. anybody else have this problem? So s BLT was done and there were no leaks but the bov one I had found but I fixed that and r checked it and had no more after that.
Also my mpg is real shit took quarter of a tank at 47 miles on it
Car is manual

 

[Kayo Stanciu]

Alright guys. It’s was the fuel pressure.. I lowered it to 42 and she runs like a champ now. Thank you everyone for you input it was greatly appreciated

 

[Brembo]

Good job. Glad you find the problem.

 

[pauleyman]

Well it was working until I had that boost leak at the bov but also had a for installed before it was located. So idk if maybe that is the problem because it ran good before the bov leak and fpr install

This should have been your biggest clue. If it was working fine and after you messed with something it wasn't it is likely the item you just touched. I am curious why did you set it to 50 in the first place. The diagnostic procedure above has helped me countless times over the last 30 years. If I just mess with something and something changed I go back to that area first.

 

[Kayo Stanciu]

This should have been your biggest clue. If it was working fine and after you messed with something it wasn't it is likely the item you just touched. I am curious why did you set it to 50 in the first place. The diagnostic procedure above has helped me countless times over the last 30 years. If I just mess with something and something changed I go back to that area first.

I didn’t set it to 50 a friend of mine had installed it and set it to 50 and I was thinking it was too high but he said that’s would it should be at and I listened to him because usually he is on top of his stuff and knows so much more than I do but he did admit to getting it confused with an other set up he had on his old one.